如果一种商品的需求减少，下面哪一种情况将会发生？（） A.价格上升且销售量下降 B.

A famous study was done in a school by a professor from a university. At the start of the school year, the teachers were given the names of five children. They were told that these five were the most excellent students in the class. But the fact was that these students were only average，and they were not the best students at all. Well, guess what? At the end of the year, all the five average students scored among the highest in the class.

　What made these average students change so much to become top students？The only difference was the change in their teachers’ attitude. Because the teachers believed that these five kids were the top students，they expected more from them. And so these five average students began to believe and expect more from themselves. So they worked harder to do as well as they could.

　Do you know why? If you expect the best from people, they’ll usually want to give you their best. A great leader said, “Treat a person just how he appears to be on the outside, and you’ll make him even worse. But treat a person like he’s already a success，and you’ll help make him the best he can be.”

　Like the true story of 7-year-old Johnny, his teacher got so angry with him that one day she said，“Johnny，you’re the naughtiest boy in this class. I’m sure you’ll never change.” The next year Johnny had a new teacher. And on the first day of class，she met with Johnny after school and said，“Johnny, I’ve heard a lot about you! But do you know that I don’t believe a word of it.” And every day after that, this new teacher treated Johnny as if he was one of the smartest students even when Johnny did naughty things. Later on, Johnny became a school leader. Because that’s the power of our belief and attitude toward children.

小题1:The professor started his research by _______.

A．teaching the five children himself

B．asking the five children to find a new teacher

C．telling the five students to work harder than ever before

D．telling the teacher the five students were the best in the class小题2:The five average students became top students mainly because of ________.

A．the professor’s study

B．the teachers’hard work

C．the change in the teachers

D．the change in the teachers’ attitude小题3:What does the passage mainly tell us？

A．Attitude and belief can change a person.

B．Only teachers can make you a top student.

C．A professor’s study can help you score highest.

D．If you want to get more，you should have new teachers.

光明中学9年级甲、乙两班在为“希望工程”捐款活动中，两班捐款的总数相同，均多于300元且少于400元．已知甲班有一人捐6元，其余每人都捐9元；乙班有一人捐13元，其余每人都捐8元．求甲、乙两班学生总人数共是多少人？

下面给出了相似的一些命题：

（1）菱形都相似 （2）等腰直角三角形都相似 （3）正方形都相似

（4）矩形都相似 （5）正六边形都相似

其中正确的有[ ]

A. 2 个

B. 3个

C. 4个

D. 5个

小巧每分钟跳126下，比小胖的2倍少48下，小胖每分钟跳几下？

颌骨囊肿的发生率高于身体其他骨，是由于

A．有牙根存在
B．咬合关系
C．龋病的发病率高
D．复杂的胚胎发育
E．颌骨内有埋伏牙